Résumé

he village is anxious to locate Professor Seltzman,inventor of a machine which can 'swap' peoples' minds. However only Seltzman knows the reversal process. Number Six is sent to locate the professor but,having been subjected to the swapping process has taken on the physical appearance of The Colonel, a new arrival at the village. The professor is found and returned to the village to oversee Number Six and The Colonel resume their old identities but the reversal is untried and those taking part are in considerable danger .